{"cve":"CVE-2020-26261","nvd":{"published":"2020-12-09T17:15:30.603","modified":"2026-06-17T03:07:56.837","status":"Modified","description":"jupyterhub-systemdspawner enables JupyterHub to spawn single-user notebook servers using systemd. In jupyterhub-systemdspawner before version 0.15 user API tokens issued to single-user servers are specified in the environment of systemd units. These tokens are incorrectly accessible to all users. In particular, the-littlest-jupyterhub is affected, which uses systemdspawner by default. This is patched in jupyterhub-systemdspawner v0.15","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","score":7.9},"cwes":["CWE-668"],"references":["https://github.com/jupyterhub/systemdspawner/blob/master/CHANGELOG.md#v015","https://github.com/jupyterhub/systemdspawner/commit/a4d08fd2ade1cfd0ef2c29dc221e649345f23580","https://github.com/jupyterhub/systemdspawner/security/advisories/GHSA-cg54-gpgr-4rm6","https://pypi.org/project/jupyterhub-systemdspawner/","https://github.com/jupyterhub/systemdspawner/blob/master/CHANGELOG.md#v015"],"products":["jupyterhub:systemdspawner"],"source":"nvd","synced_at":"2026-10-19T21:12:09.559580076+00:00"},"epss":{"cve":"CVE-2020-26261","score":0.0048,"percentile":0.41456,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-cg54-gpgr-4rm6","url":"https://osv.dev/vulnerability/GHSA-cg54-gpgr-4rm6","summary":"user-readable api tokens in systemd units for JupyterHub","modified":"2026-09-10T03:49:00.478208411Z","packages":[{"ecosystem":"PyPI","name":"jupyterhub-systemdspawner","purl":"pkg:pypi/jupyterhub-systemdspawner","ranges":["<0.15.0"],"fixed":["0.15.0"]}]},{"id":"PYSEC-2020-52","url":"https://osv.dev/vulnerability/PYSEC-2020-52","summary":"","modified":"2023-11-08T04:03:16.807176Z","packages":[{"ecosystem":"PyPI","name":"jupyterhub-systemdspawner","purl":"pkg:pypi/jupyterhub-systemdspawner","ranges":["<0.15.0"],"fixed":["0.15.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}